<template>

  <a-select
    v-if="async"
    showSearch
    labelInValue
    :disabled="disabled"
    :getPopupContainer="getParentContainer"
    @search="loadData"
    :placeholder="placeholder"
    v-model="selectedAsyncValue"
    style="width: 100%"
    :filterOption="false"
    @change="handleAsyncChange"
    allowClear
    :notFoundContent="loading ? undefined : null"
  >
    <a-spin v-if="loading" slot="notFoundContent" size="small"/>
    <a-select-option v-for="d in options" :key="d.value" :value="d.value">{{ d.text }}</a-select-option>
  </a-select>

  <a-select
    v-else
    :getPopupContainer="getParentContainer"
    showSearch
    :disabled="disabled"
    :placeholder="placeholder"
    optionFilterProp="children"
    style="width: 100%"
    @change="handleChange"
    :filterOption="filterOption"
    v-model="selectedValue"
    allowClear
    :notFoundContent="loading ? undefined : null">
    <a-spin v-if="loading" slot="notFoundContent" size="small"/>
    <a-select-option v-for="d in options" :key="d.value" :value="d.value">{{ d.text }}</a-select-option>
  </a-select>

</template>

<script>
  import { getDictItemsByCode, getDictItemsFromCache } from '@/api/api'
  import debounce from 'lodash/debounce';
  import { getAction } from '../../api/manage'
  import { serviceApi } from '@/api/common.js'

  export default {
    name: 'JSearchSelectTag',
    props: {
      disabled: Boolean,
      value: [String, Number],
      dictOptions: Array,
      async: Boolean,
      placeholder: {
        type: String,
        default: '请选择',
        required:false
      },
      dict:{
        type: String,
        default: '',
        required: false
      },
      popContainer: {
        type: String,
        default: '',
        required: false
      },
      pageSize: {
        type: Number,
        default: 10,
        required: false
      },
      getPopupContainer: {
        type:Function,
        default: null
      },
    },
    data() {
      this.loadData = debounce(this.loadData, 800);// 消抖
      this.lastLoad = 0;
      return {
        loading: false,
        selectedValue: [],
        selectedAsyncValue: [],
        options: []
      }
    },
    created() {
      this.initDictData();
    },
    watch: {
      'value': {
        immediate: true,
        handler(val) {
          if (!val) {
            if (val == 0) {
              this.initSelectValue()
            } else {
              this.selectedValue = []
              this.selectedAsyncValue = []
            }
          } else {
            this.initSelectValue()
          }
        }
      },
      'dict': {
        handler() {
          this.initDictData()
        }
      },
      'dictOptions': {
        deep: true,
        handler(val) {
          if (val && val.length > 0) {
            this.options = [...val]
          }
        }
      }
    },
    methods: {
      initSelectValue() {
        if (this.async) {
          if (!this.selectedAsyncValue || !this.selectedAsyncValue.key || this.selectedAsyncValue.key != this.value) {
            console.log('这才请求后台')
            //update-begin-author:taoyan date:20220112 for: 方法initSelectValue 根据下拉框实际值查询下拉框的显示的文本 因后台接口只处理3个参数，所以将过滤条件去掉
            // TODO 隐患 查询效率问题 还是应该在后台作筛选
            let itemDictStr = this.dict
            let arr = itemDictStr.split(',')
            if(arr && arr.length==4){
              // 删除最后一个元素
              arr.pop();
              itemDictStr = arr.join(',')
            }
            //update-end-author:taoyan date:20220112 for: 方法initSelectValue 根据下拉框实际值查询下拉框的显示的文本 因后台接口只处理3个参数，所以将过滤条件去掉
            getAction(`${serviceApi.dict}/dicts/dict-item-texts/${itemDictStr}`, { key: this.value }).then(res => {
              if (res.success) {
                let obj = {
                  key: this.value,
                  label: res.result
                }
                this.selectedAsyncValue = { ...obj }
              }
            })
          }
        } else {
          this.selectedValue = this.value.toString()
        }
      },
      loadData(value) {
        console.log('数据加载', value)
        this.lastLoad += 1
        const currentLoad = this.lastLoad
        this.options = []
        this.loading = true
        // 字典code格式：table,text,code
        getAction(`${serviceApi.dict}/dicts/dict-item/${this.dict}`, { keyword: value, pageSize: this.pageSize }).then(res => {
          this.loading = false
          if (res.success) {
            if (currentLoad !== this.lastLoad) {
              return
            }
            this.options = res.result
            console.log('我是第一个', res)
          } else {
            this.$message.warning(res.message)
          }
        })
      },
      initDictData() {
        if (!this.async) {
          // 如果字典项集合有数据
          if (this.dictOptions && this.dictOptions.length > 0) {
            this.options = [...this.dictOptions]
          } else {
            // 根据字典Code, 初始化字典数组
            let dictStr = ''
            if (this.dict) {
                let arr = this.dict.split(',')
                if (arr[0].indexOf('where') > 0) {
                  let tbInfo = arr[0].split('where')
                  dictStr = tbInfo[0].trim() + ',' + arr[1] + ',' + arr[2] + ',' + encodeURIComponent(tbInfo[1])
                } else {
                  dictStr = this.dict
                }
                if (this.dict.indexOf(',') == -1) {
                  // 优先从缓存中读取字典配置
                  if (getDictItemsFromCache(this.dictCode)) {
                    this.options = getDictItemsFromCache(this.dictCode);
                    return
                  }
                }
                getDictItemsByCode(dictStr, null).then((res) => {
                  if (res.success) {
                    this.options = res.result;
                  }
                })
            }
          }
        }else{
          if(!this.dict){
            console.error('搜索组件未配置字典项')
        } else {
          // 异步一开始也加载一点数据
          this.loading = true
          getAction(`${serviceApi.dict}/dicts/dict-item/${this.dict}`, { pageSize: this.pageSize, keyword: '' }).then(res => {
            this.loading = false
            if (res.success) {
              this.options = res.result
            } else {
              this.$message.warning(res.message)
            }
          })
        }
        }
      },
      filterOption(input, option) {
        return option.componentOptions.children[0].text.toLowerCase().indexOf(input.toLowerCase()) >= 0
      },
      handleChange (selectedValue) {
        console.log('selectedValue', selectedValue)
        this.selectedValue = selectedValue
        this.callback()
      },
      handleAsyncChange(selectedObj) {
        // update-begin-author:scott date:20201222 for:【搜索】搜索查询组件，删除条件，默认下拉还是上次的缓存数据，不好 JT-191
        if (selectedObj) {
          this.selectedAsyncValue = selectedObj
          this.selectedValue = selectedObj.key
        } else {
          this.selectedAsyncValue = null
          this.selectedValue = null
          this.options = null
          this.loadData('')
        }
        this.callback()
        // update-end-author:scott date:20201222 for:【搜索】搜索查询组件，删除条件，默认下拉还是上次的缓存数据，不好 JT-191
      },
      callback() {
        this.$emit('change', this.selectedValue);
      },
      setCurrentDictOptions(dictOptions) {
        this.options = dictOptions
      },
      getCurrentDictOptions() {
        return this.options
      },
      getParentContainer(node){
        if(typeof this.getPopupContainer === 'function'){
          return this.getPopupContainer(node)
        } else if(!this.popContainer){
          return node.parentNode
        } else {
          return document.querySelector(this.popContainer)
        }
      }

    },
    model: {
      prop: 'value',
      event: 'change'
    }
  }
</script>

<style scoped>

</style>
